Feature: 1. Adopt electronic fine adjustment, which provides high efficiency and high accuracy. 2. High efficiency, using electromagnetic vibration method, with low power consumption. 3. Low noise, manufactured according to the principle of air flow, using double sound insulation. 4. Rotate the knob to adjust the air volume to meet the oxygen demand of different fish. 5. Anti‑vibration foot pads effectively reduce the vibration transmission of the machine and work more quietly. Specification: Item Type: Aquarium Air PumpMaterial: ABSColor: As Picture ShownWeight: Approx. 1092g/38.5ozPower: 8W Maximum Air Output: 4x3L/min Connect 4mm/0.16in oxygen tube. Package List: 1 x Aquarium Air Pump1 x Manual Note: 1. Place the oxygenating pump 25cm/9.8in above the surface of the fish tank to avoid stopping the oxygenating pump, there is an inverted inflow of water: the oxygen pump must be placed below the surface of the tankinstall the check valve2.Oxygen pump is not waterproof, to avoid damage caused by oxygen pump water3. In order to prevent accidents, please do not put the oxygen pump in places with inflammable and explosive materials4. Unplug the power plug or disconnect the power switch before maintenance